package com.shen.utils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

// sqlSessionFactoryBuilder ---> sqlSessionFactory
// sqlSessionFactory ---> sqlSession
// sqlSession包含了面向数据库执行sql命令所需的所有方法
public class MybatisUtils {
    private static SqlSessionFactory sqlSessionFactory;
    static {
        try {
            // 获取sqlSessionFactory。通过建造者模式来获取
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static SqlSession getSqlSession(){
        // 获取sqlSession。通过工厂模式来获取
//        SqlSession sqlSession = sqlSessionFactory.openSession();
//        return sqlSession;
        return sqlSessionFactory.openSession();
    }
    
}
